Camera: Clarify AF_REGIONS behavior in capture_result

If application specifies 0-weight AF_REGIONS in capture request, the
camera device is allowed to override with non-0-weight AF_REGIONS in
capture result.

Test: Build
Bug: 29398609
Change-Id: I771ba45a1ae0fd26fcacc9891aa4444f718f0f3c
2 files changed